Network statistics over time.  See text for explanation of the different statistics calculated here.  Solid lines correspond to observed values; shaded ribbons correspond to 90% confidence intervals on rewired networks, where 5% of the observed edges are randomly rewired while maintaining each node's degree distributions.  100 rewired networks are generated for each author set-year combination.  Dashed lines correspond to observed values for authors with 50 or more total papers in the data.  Blue corresponds to the MoBE collaboration; red corresponds to the peer comparison set of authors.  Vertical lines indicate 2004, the first year of research funding by the MoBE program.  Due to publication lags, we would not expect to see effects from 2004 funding until 2006-07.